CN111538305B - Thermal power generating unit water supply and fuel control intelligent optimization method, system and medium based on demand diagnosis - Google Patents

Thermal power generating unit water supply and fuel control intelligent optimization method, system and medium based on demand diagnosis Download PDF

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CN111538305B
CN111538305B CN202010456200.3A CN202010456200A CN111538305B CN 111538305 B CN111538305 B CN 111538305B CN 202010456200 A CN202010456200 A CN 202010456200A CN 111538305 B CN111538305 B CN 111538305B
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main steam
water supply
steam temperature
actual measured
set value
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CN111538305A (en
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王锡辉
张建玲
陈厚涛
朱晓星
朱光明
王志杰
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan Electric Power Co Ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
    • G05B19/41865—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by job scheduling, process planning, material flow
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/04—Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0631—Resource planning, allocation, distributing or scheduling for enterprises or organisations
    • G06Q10/06315—Needs-based resource requirements planning or analysis
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

The invention discloses a method, a system and a medium for intelligently optimizing the water supply and fuel control of a thermal power generating unit based on demand diagnosis, wherein the method comprises the steps of obtaining the current state and the variation trend of the main steam pressure and the main steam temperature of the thermal power generating unit; respectively obtaining corresponding water supply control optimization instructions according to the current states and the variation trends of the main steam pressure and the main steam temperature through a preset water supply regulation demand mapping table, and respectively obtaining corresponding fuel control optimization instructions according to the current states and the variation trends of the main steam pressure and the main steam temperature through a preset fuel regulation demand mapping table; and superposing the water supply control optimization instruction and the fuel control optimization instruction into a water supply control loop and a fuel control loop of a thermal power generating unit coordinated control system. The control method has the advantages of prediction and decoupling functions, capability of improving the regulation quality of a control system with strong coupling and large hysteresis and delay characteristics, relatively simple algorithm, realization on any control system and easy engineering implementation and popularization.

Description

Thermal power generating unit water supply and fuel control intelligent optimization method, system and medium based on demand diagnosis
Technical Field
The invention relates to an automatic control engineering technology of a thermal power generating unit, in particular to an intelligent optimization method, system and medium for thermal power generating unit water supply and fuel control based on demand diagnosis.
Background
With the gradual increase of the consumption ratio of the clean energy, the structure of the power supply is changed greatly. The peak regulation property of the thermal power generating unit is more and more obvious, and the normal operation state can be realized by frequently changing the load and maintaining the low-load operation for a long time. The operation economy of the thermal power generating unit under the full-load working condition determines the market competitiveness and the survival space of the thermal power generating unit to a certain extent.
In recent years, the proportion of installed capacity of an ultra (supercritical) power plant unit to a thermal power plant unit has been increasing. The coordination control system of the supercritical parameter unit has the characteristics of multivariable input and output, nonlinearity and strong coupling. The quality of the coordinated control system directly affects the operating economy of the unit. On one hand, many power generation enterprises are checked for the fact that the AGC variable load rate cannot meet the requirement due to poor quality of a coordinated control system, and direct economic loss is caused; on the other hand, the coordinated control systems of many units have difficulty controlling the main operating parameters at the economic operating point.
From the dimension of industrial technology development, Chinese power equipment gradually shifts to an intelligent stage. For the thermal power generating unit, the control system is the intelligent core of the thermal power plant, and mainly comprises three levels: the intelligent device comprises an intelligent device layer, an intelligent control layer and an intelligent management layer. The intelligent control layer is used for controlling, optimizing and diagnosing the production and auxiliary devices of the thermal power plant on the basis of the equipment layer. The intelligent control technology obtains good effect after years of development, and the progress of intelligent construction of the coal-fired power plant is powerfully promoted. The intelligent diagnosis and intelligent optimization of the thermal power generating unit are important contents of intelligent construction of power plants for a period of time in the future, and represent the development trend of industrial technology.
Currently, the intelligent optimization control technology has the following problems. 1. When a multivariable, strong-coupling and nonlinear time-varying object model is established by adopting a neural network, the accuracy, effectiveness and universality of sample data are crucial to the establishment and training of the model, a more advanced algorithm needs to be researched, and the problem of limited sample quantity is solved; 2. the intelligent optimization algorithm has large calculation amount and relatively low searching speed, is difficult to ensure that a global optimal solution is found in limited time, and has adverse effect on the real-time performance of control; 3. the intelligent optimization algorithm is often used independently, is not organically integrated with the traditional PID control, and needs to be improved in the aspect of accurate response characteristic; 4. the modeling and optimizing processes of the neural network and the intelligent optimization algorithm need complex calculation, are difficult to complete by using the existing configuration tool of the DCS, and need development of an independent system, so that the popularization and the application of the technology are limited. In a word, how to improve the quality of coordination control through intelligent optimization and easy to implement and popularize engineering are still problems to be solved.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the invention provides a thermal power generating unit water supply and fuel control intelligent optimization method, system and medium based on demand diagnosis, wherein the method comprises the steps of analyzing the current feedback and the variation trend of main steam pressure and main steam temperature, obtaining targeted optimization instructions after comprehensive diagnosis, enabling a control algorithm to have a prediction function and a decoupling function, improving the regulation quality of a control system with strong coupling and large lag and delay, enabling the algorithm to be relatively simple, being capable of being realized on any control system, and being easy to implement and popularize in engineering.
In order to solve the technical problems, the invention adopts the technical scheme that:
a thermal power generating unit water supply and fuel control intelligent optimization method based on demand diagnosis comprises the following implementation steps:
1) acquiring the current state and the variation trend of the main steam pressure and the main steam temperature of the thermal power generating unit;
2) respectively obtaining corresponding water supply control optimization instructions according to the current states and the variation trends of the main steam pressure and the main steam temperature through a preset water supply regulation demand mapping table, and respectively obtaining corresponding fuel control optimization instructions according to the current states and the variation trends of the main steam pressure and the main steam temperature through a preset fuel regulation demand mapping table;
3) and superposing the water supply control optimization instruction and the fuel control optimization instruction into a water supply control loop and a fuel control loop of a thermal power generating unit coordinated control system.
Optionally, the detailed step in step 2) of obtaining the corresponding feedwater control optimization instruction by respectively using the current state and the variation trend of the main steam pressure and the main steam temperature through a preset feedwater regulation demand mapping table includes:
2.1A) respectively obtaining corresponding water supply regulation requirements of the current state and the variation trend of the main steam pressure and the main steam temperature through a preset water supply regulation requirement mapping table, wherein the water supply regulation requirement mapping table comprises the mapping relation of the current state and the variation trend of the main steam pressure and the main steam temperature and the corresponding water supply regulation requirements;
2.2A) mapping the feedwater regulating demand to a preset feedwater control optimization command.
Optionally, the mapping table of the feedwater regulation demand in step 2.1A) includes the mapping relationship between the main steam pressure, the current state and the variation trend of the main steam temperature, and the corresponding feedwater regulation demand, as follows:
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is constant: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increasing, the water supply regulation demand is increased in two stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreasing, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in two stages, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increasing, the water supply regulation demand is decreased in one stage, and if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreasing, the water supply;
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is increasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in two stages, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in one stage, and if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreased;
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is decreasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in a second stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in a first stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in a third stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is constant: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in two stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in three stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreased;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is increasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in two stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in three stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in two stages, if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreased;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is decreasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in two stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in three stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in one stage, and if the actual measured value of the main steam temperature is lower than the set value and the change trend.
Optionally, the detailed steps of step 2.2A) include: presetting a water supply control optimization instruction to correspond to the water supply regulation requirement one by one. Wherein the water supply control optimization command is obtained by the deviation between the set value and the measured value of the main steam temperature through a broken line function F1(x)～F7(x) And obtaining after mapping.
Optionally, the detailed step in step 2) of obtaining the corresponding fuel control optimization command by respectively using the current state and the variation trend of the main steam pressure and the main steam temperature through a preset fuel regulation demand mapping table includes:
2.1B) respectively obtaining corresponding fuel regulation requirements of the current state and the variation trend of the main steam pressure and the main steam temperature through a preset fuel regulation requirement mapping table, wherein the fuel regulation requirement mapping table comprises the mapping relation of the current state and the variation trend of the main steam pressure and the main steam temperature and the corresponding fuel regulation requirements;
2.2B) mapping the fuel regulation demand to a preset fuel control optimization command through coding.
Optionally, the mapping relationship between the main steam pressure, the current state and the variation trend of the main steam temperature and the corresponding fuel regulation demand contained in the fuel regulation demand mapping table in step 2.1B) is as follows:
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is constant: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is two-stage reduction, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increasing, the fuel regulation demand is three-stage reduction, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreasing, the fuel regulation demand is one-stage reduction, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the fuel regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increasing, the fuel regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreasing, the fuel regulation demand is constant;
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is increasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is two-stage reduction, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increasing, the fuel regulation demand is three-stage reduction, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreasing, the fuel regulation demand is two-stage reduction, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the fuel regulation demand is one-stage reduction, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increasing, the fuel regulation demand is one-stage reduction, and if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreasing, the fuel;
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is decreasing: the fuel regulation requirement is unchanged no matter the current state and the variation trend of the main steam temperature;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is constant: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the fuel regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the fuel regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the fuel regulation demand is increased in a second stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the fuel regulation demand is increased in a first stage, and if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreased;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is increasing: the fuel regulation requirement is unchanged no matter the current state and the variation trend of the main steam temperature;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is decreasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is increased in a second stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the fuel regulation demand is increased in a third stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is.
Optionally, the detailed steps of step 2.2B) include: the fuel control optimization instructions are preset to correspond to the fuel regulation requirements one to one. Wherein the fuel control optimization command is derived from the deviation between the main steam pressure set point and the measured value via a polyline function G1(x)～G7(x) And obtaining after mapping.
Optionally, when the water supply control optimization instruction and the fuel control optimization instruction are superimposed on the water supply control loop and the fuel control loop of the thermal power generating unit coordinated control system in step 3), the method further includes the step of controlling the tracking switching of the water supply control optimization instruction and the fuel control optimization instruction: when all links of the water supply control loop are put into automation and continue for 45-70 s, the water supply control optimization instruction is acted, otherwise, the water supply control optimization instruction is 0; when all links of the fuel control loop are put into automation and continue for 45-70 s, the fuel control optimization instruction is acted, otherwise, the fuel control optimization instruction is 0.
In addition, the invention also provides a thermal power generating unit water supply and fuel control intelligent optimization system based on demand diagnosis, which comprises a computer device, wherein the computer device is programmed or configured to execute the steps of the thermal power generating unit water supply and fuel control intelligent optimization method based on demand diagnosis, or a computer program which is programmed or configured to execute the thermal power generating unit water supply and fuel control intelligent optimization method based on demand diagnosis is stored in a memory of the computer device.
In addition, the invention also provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program which is programmed or configured to execute the intelligent optimization method for the water supply and fuel control of the thermal power generating unit based on the demand diagnosis.
Compared with the prior art, the invention has the following advantages:
1. the method adopts the current state and the variation trend of the main steam pressure and the main steam temperature of the thermal power generating unit to map and obtain the corresponding water supply control optimization instruction and the fuel control optimization instruction, and superposes the water supply control optimization instruction and the fuel control optimization instruction into the water supply control loop and the fuel control loop of the thermal power generating unit coordinated control system, has less optimization adopted parameter data, can be realized only according to the current state and the variation trend of the main steam pressure and the main steam temperature, is simple to realize, can effectively improve the coordinated control quality, and is easy to implement and popularize in engineering.
2. According to the invention, the current states and the variation trends of the main steam pressure and the main steam temperature respectively pass through a preset water supply regulation demand mapping table to obtain corresponding water supply control optimization instructions, and the current states and the variation trends of the main steam pressure and the main steam temperature respectively pass through a preset fuel regulation demand mapping table to obtain corresponding fuel control optimization instructions, so that the original complex and disordered demands are ordered by adopting a mapping mode, and the control program is simpler and clearer; during state analysis, controlled parameters with coupling relations are combined, all possible states are considered comprehensively, and a special optimization instruction is designed for each state, so that the optimization control is more targeted.
3. And each optimization control instruction is roughly divided according to the mapping relation of the regulation requirements, and is subdivided according to the deviation of the controlled parameter and the set value, so that the high intelligentization and self-adaption functions of the optimization control instructions are realized.
4. The method does not relate to a complex model, is based on an anthropomorphic optimization control idea, can be realized in a general control system of the current thermal power generating unit, can also be realized through an independent platform, is easy for engineering implementation and has wide applicability.
Drawings
FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a water control optimization instruction according to an embodiment of the present invention.
FIG. 3 is a schematic flow chart of fuel control optimization instructions in an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the implementation steps of the intelligent optimization method for controlling the water supply and the fuel of the thermal power generating unit based on the demand diagnosis in the embodiment include:
1) acquiring the current state and the variation trend of the main steam pressure and the main steam temperature of the thermal power generating unit;
2) respectively obtaining corresponding water supply control optimization instructions according to the current states and the variation trends of the main steam pressure and the main steam temperature through a preset water supply regulation demand mapping table, and respectively obtaining corresponding fuel control optimization instructions according to the current states and the variation trends of the main steam pressure and the main steam temperature through a preset fuel regulation demand mapping table;
3) and superposing the water supply control optimization instruction and the fuel control optimization instruction into a water supply control loop and a fuel control loop of a thermal power generating unit coordinated control system.
In this embodiment, the detailed step of obtaining the corresponding feedwater control optimization instruction by respectively passing the current state and the variation trend of the main steam pressure and the main steam temperature through the preset feedwater regulation demand mapping table in step 2) includes:
2.1A) respectively obtaining corresponding water supply regulation requirements of the current state and the variation trend of the main steam pressure and the main steam temperature through a preset water supply regulation requirement mapping table, wherein the water supply regulation requirement mapping table comprises the mapping relation of the current state and the variation trend of the main steam pressure and the main steam temperature and the corresponding water supply regulation requirements;
2.2A) mapping the feedwater regulating demand to a preset feedwater control optimization command.
In this embodiment, the mapping table of the water supply regulation demand in step 2.1A) includes the following mapping relationship between the current state and the variation trend of the main steam pressure and the main steam temperature and the corresponding water supply regulation demand:
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is constant: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increasing, the water supply regulation demand is increased in two stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreasing, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in two stages, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increasing, the water supply regulation demand is decreased in one stage, and if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreasing, the water supply;
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is increasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in two stages, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in one stage, and if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreased;
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is decreasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in a second stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in a first stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in a third stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is constant: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in two stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in three stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreased;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is increasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in two stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in three stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in two stages, if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreased;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is decreasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in two stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in three stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in one stage, and if the actual measured value of the main steam temperature is lower than the set value and the change trend.
In this embodiment, the demand of the controlled parameter for the adjustment amount is divided into 7 levels, the optimization instruction value corresponding to each level is related to the magnitude of deviation of the controlled parameter from the set value, and each optimization instruction is roughly divided according to the regulation demand coding level, so that the adaptive function of the optimization control instruction is realized. The above mapping relationship is summarized in table 1.
Table 1: and a water supply requirement mapping relation table.
Figure GDA0002892321380000081
Figure GDA0002892321380000091
As shown in fig. 2, the detailed steps of step 2.2A) of this embodiment include: number i from broken line function F according to water supply regulation demand1(x)～Fn(x) To select a corresponding polyline function Fi(x) Said Fi(x) The function of the deviation between the main steam temperature set value and the measured value is adopted, and the highly intelligent and self-adaptive functions of the water supply optimization control instruction are realized.
As can be seen from the table 1, in the embodiment, the fuel regulation demand code is 1-7, and 7 sets of water supply control optimization instructions are set according to the code numbers 1-7 of the fuel regulation demand, and are named as water supply control optimization instructions 1-7 respectively; taking the coded number as a switching condition for selecting the water supply control optimization instruction, taking the water supply control optimization instruction 1 as the output of the water supply control optimization instruction when the coded number is 1, taking the water supply control optimization instruction 2 as the output of the water supply control optimization instruction when the coded number is 2, and so on, and taking the output of the water supply control optimization instruction as 0 when the coded number is not equal to any one of the numbers 1-7; the water supply control optimization instructions 1-7 are calculated by the deviation between the set value and the measured value of the main steam temperature through a broken line function F1(x)～F7(x) Obtaining after mapping. In this embodiment, the polyline function F1(x)～F7(x) Examples of values of (d) are shown in table 2.
Table 2: polyline function F1(x)～F7(x)。
Figure GDA0002892321380000092
In this embodiment, the polyline function F1(x)～F7(x) The output value of (a) refers to the amount of change in the control system per scanning cycle.
In this embodiment, the detailed step of obtaining the corresponding fuel control optimization instruction by respectively passing the current state and the variation trend of the main steam pressure and the main steam temperature through the preset fuel regulation demand mapping table in step 2) includes:
2.1B) respectively obtaining corresponding fuel regulation requirements of the current state and the variation trend of the main steam pressure and the main steam temperature through a preset fuel regulation requirement mapping table, wherein the fuel regulation requirement mapping table comprises the mapping relation of the current state and the variation trend of the main steam pressure and the main steam temperature and the corresponding fuel regulation requirements;
2.2B) mapping the fuel regulation demand to a preset fuel control optimization command through coding.
In this embodiment, the mapping relationship between the current state and the variation trend of the main steam pressure and the main steam temperature and the corresponding fuel regulation requirement included in the fuel regulation requirement mapping table in step 2.1B) is as follows:
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is constant: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is two-stage reduction, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increasing, the fuel regulation demand is three-stage reduction, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreasing, the fuel regulation demand is one-stage reduction, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the fuel regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increasing, the fuel regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreasing, the fuel regulation demand is constant;
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is increasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is two-stage reduction, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increasing, the fuel regulation demand is three-stage reduction, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreasing, the fuel regulation demand is two-stage reduction, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the fuel regulation demand is one-stage reduction, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increasing, the fuel regulation demand is one-stage reduction, and if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreasing, the fuel;
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is decreasing: the fuel regulation requirement is unchanged no matter the current state and the variation trend of the main steam temperature;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is constant: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the fuel regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the fuel regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the fuel regulation demand is increased in a second stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the fuel regulation demand is increased in a first stage, and if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreased;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is increasing: the fuel regulation requirement is unchanged no matter the current state and the variation trend of the main steam temperature;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is decreasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is increased in a second stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the fuel regulation demand is increased in a third stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is.
In this embodiment, the demand of the controlled parameter for the adjustment amount is divided into 7 levels, the optimization instruction value corresponding to each level is related to the magnitude of deviation of the controlled parameter from the set value, and each optimization instruction is roughly divided according to the coding level of the regulation demand. The above mapping relationship is summarized in table 3.
Table 3: a fuel demand map table.
Figure GDA0002892321380000111
Figure GDA0002892321380000121
As shown in fig. 3, the detailed steps in step 2.2B) of this embodiment include: from the broken-line function G according to the number i of the fuel regulation demand1(x)～Gn(x) To select a corresponding polyline function Gi(x) Said G isi(x) The highly intelligent and adaptive function of the fuel optimization control command is realized as a function of the deviation between the main steam pressure set value and the measured value. .
As can be seen from Table 3, this embodimentIn the embodiment, the water supply regulation requirement code is 1-7, and 7 sets of fuel control optimization instructions are set according to the code number of 1-7 and are named as fuel control optimization instructions 1-7 respectively; taking the coded number as a switching condition for selecting the fuel control optimization instruction, taking the fuel control optimization instruction 1 as the output of the fuel control optimization instruction when the coded number is 1, taking the fuel control optimization instruction 2 as the output of the fuel control optimization instruction when the coded number is 2, and so on, and taking the output of the fuel control optimization instruction as 0 when the coded number is not equal to any one of the numbers 1-7; the fuel control optimization instructions 1-7 are calculated by the deviation between the set value and the measured value of the main steam pressure through a broken line function G1(x)～G7(x) And obtaining after mapping. In this embodiment, the polyline function G1(x)～G7(x) Examples of values for (b) are shown in the following table:
table 4: polyline function G1(x)～G7(x) Example of values of (d).
Figure GDA0002892321380000122
In this embodiment, the polyline function G1(x)～G7(x) The output value of (a) refers to the amount of change in the control system per scanning cycle.
In this embodiment, the step 3) of superposing the water supply control optimization instruction and the fuel control optimization instruction on the water supply control loop and the fuel control loop of the coordinated control system of the thermal power generating unit is specifically realized by the following method: reserving all control loops and adjusting parameters in the original coordination control system; superposing a water supply control optimization instruction on a water supply set value of an original water supply control loop; and the fuel control optimization instruction is superposed on the fuel set value of the original fuel control loop, so that the optimization control of the conventional thermal power generating unit coordinated control system is realized.
In this embodiment, when the water supply control optimization instruction and the fuel control optimization instruction are superimposed on the water supply control loop and the fuel control loop of the coordinated control system of the thermal power generating unit in step 3), the method further includes the following steps of controlling the tracking and switching of the water supply control optimization instruction and the fuel control optimization instruction: when all links of the water supply control loop are put into automation and continue for 45-70 s, the water supply control optimization instruction is acted, otherwise, the water supply control optimization instruction is 0; when all links of the fuel control loop are put into automation and continue for 45-70 s, the fuel control optimization instruction is acted, otherwise, the fuel control optimization instruction is 0. In this embodiment, the duration is 60s, when all the links of the water supply control loop are put into automation and continue for 60s, the water supply control optimization instruction is acted, otherwise, the duration is 0; the fuel control optimization command is active when all segments of the fuel control loop are put into automation and last for 60s, otherwise it is 0.
In this embodiment, the inputting/outputting of the water supply control optimization command and the fuel control optimization command in step 3) is specifically performed by respectively setting a water supply control optimization command inputting/outputting button and a fuel control optimization command inputting/outputting button on the operation interface, and independently controlling the inputting/outputting of the water supply control optimization command and the inputting/outputting of the fuel control optimization command.
In summary, the intelligent optimization method for controlling the water supply and the fuel of the thermal power generating unit based on the demand diagnosis in the embodiment has the following advantages: 1. the embodiment carries out the demand coding of the regulating quantity based on the state analysis of the controlled parameters, thereby ordering the original complex and disordered demand and leading the control program to be more concise and clear; during state analysis, controlled parameters with coupling relations are combined, all possible states are considered comprehensively, and a special optimization instruction is designed for each state, so that the optimization control is more targeted. 2. In the embodiment, the requirements of the controlled parameters on the regulating quantity are divided into 7 levels, the optimization instruction value corresponding to each level is related to the deviation of the controlled parameters from the set values, each optimization instruction is roughly divided according to the coding level of the regulating requirements, and is subdivided according to the deviation of the controlled parameters and the set values, so that the high intelligence and self-adaptive functions of the optimization control instructions are realized. 3. The embodiment fully considers the tracking switching function and the input/exit function of the intelligent optimization instruction, enables operators to have high autonomous selectivity, and does not cause any disturbance to an original control system in the input and exit processes of the optimization instruction. 4. The method adopted by the embodiment does not relate to a complex model, can be realized in a general control system of the current thermal power generating unit based on an anthropomorphic optimization control idea, can also be realized through an independent platform, is easy for engineering implementation, and has wide applicability.
In addition, the present embodiment also provides an intelligent optimization system for thermal power generating unit water supply and fuel control based on demand diagnosis, which includes a computer device programmed or configured to execute the steps of the aforementioned intelligent optimization method for thermal power generating unit water supply and fuel control based on demand diagnosis, or a memory of the computer device stored with a computer program programmed or configured to execute the aforementioned intelligent optimization method for thermal power generating unit water supply and fuel control based on demand diagnosis.
In addition, the present embodiment also provides a computer readable storage medium, which stores thereon a computer program programmed or configured to execute the intelligent optimization method for the feedwater and fuel control of the thermal power generating unit based on the demand diagnosis.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is directed to methods, apparatus (systems), and computer program products according to embodiments of the application wherein instructions, which execute via a flowchart and/or a processor of the computer program product, create means for implementing functions specified in the flowchart and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (10)

1. A thermal power generating unit water supply and fuel control intelligent optimization method based on demand diagnosis is characterized by comprising the following implementation steps:
1) acquiring the current state and the variation trend of the main steam pressure and the main steam temperature of the thermal power generating unit;
2) respectively obtaining corresponding water supply control optimization instructions according to the current states and the variation trends of the main steam pressure and the main steam temperature through a preset water supply regulation demand mapping table, and respectively obtaining corresponding fuel control optimization instructions according to the current states and the variation trends of the main steam pressure and the main steam temperature through a preset fuel regulation demand mapping table;
3) and superposing the water supply control optimization instruction and the fuel control optimization instruction into a water supply control loop and a fuel control loop of a thermal power generating unit coordinated control system.
2. The intelligent optimization method for the thermal power generating unit water supply and fuel control based on demand diagnosis as claimed in claim 1, wherein the detailed step of obtaining the corresponding water supply control optimization command in step 2) by respectively passing the current state and the variation trend of the main steam pressure and the main steam temperature through a preset water supply regulation demand mapping table comprises:
2.1A) respectively obtaining corresponding water supply regulation requirements of the current state and the variation trend of the main steam pressure and the main steam temperature through a preset water supply regulation requirement mapping table, wherein the water supply regulation requirement mapping table comprises the mapping relation of the current state and the variation trend of the main steam pressure and the main steam temperature and the corresponding water supply regulation requirements;
2.2A) mapping the feedwater regulating demand to a preset feedwater control optimization command.
3. The thermal power generating unit water supply and fuel control intelligent optimization method based on demand diagnosis as claimed in claim 2, wherein the mapping table of the water supply regulation demand in step 2.1A) contains the mapping relationship between the current state and the variation trend of the main steam pressure and the main steam temperature and the corresponding water supply regulation demand as follows:
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is constant: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increasing, the water supply regulation demand is increased in two stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreasing, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in two stages, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increasing, the water supply regulation demand is decreased in one stage, and if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreasing, the water supply;
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is increasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in two stages, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in one stage, and if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreased;
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is decreasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in a second stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in a first stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in a third stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is constant: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in two stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in three stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreased;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is increasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in two stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in three stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in two stages, if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreased;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is decreasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the water supply regulation demand is increased in two stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the water supply regulation demand is increased in three stages, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the water supply regulation demand is increased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the water supply regulation demand is decreased in one stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the water supply regulation demand is decreased in one stage, and if the actual measured value of the main steam temperature is lower than the set value and the change trend.
4. The intelligent optimization method for the water and fuel control of the thermal power generating unit based on the demand diagnosis as claimed in claim 2, wherein the detailed step of the step 2.2A) comprises the following steps: presetting a water supply control optimization instruction to correspond to the water supply regulation requirement one by one, wherein the water supply control optimization instruction is formed by the deviation between a main steam temperature set value and a measured value through a broken line function F1(x)～F7(x) And obtaining after mapping.
5. The intelligent optimization method for the water supply and the fuel control of the thermal power generating unit based on the demand diagnosis as claimed in claim 1, wherein the detailed step of obtaining the corresponding fuel control optimization command in the step 2) by respectively using the current state and the variation trend of the main steam pressure and the main steam temperature through a preset fuel regulation demand mapping table comprises the following steps:
2.1B) respectively obtaining corresponding fuel regulation requirements of the current state and the variation trend of the main steam pressure and the main steam temperature through a preset fuel regulation requirement mapping table, wherein the fuel regulation requirement mapping table comprises the mapping relation of the current state and the variation trend of the main steam pressure and the main steam temperature and the corresponding fuel regulation requirements;
2.2B) mapping the fuel adjustment demand to a preset fuel control optimization command.
6. The intelligent optimization method for the water supply and fuel control of the thermal power generating unit based on the demand diagnosis as claimed in claim 5, wherein the mapping relation between the main steam pressure, the current state and the variation trend of the main steam temperature and the corresponding fuel regulation demand contained in the fuel regulation demand mapping table in the step 2.1B) is as follows:
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is constant: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is two-stage reduction, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increasing, the fuel regulation demand is three-stage reduction, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreasing, the fuel regulation demand is one-stage reduction, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the fuel regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increasing, the fuel regulation demand is constant, if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreasing, the fuel regulation demand is constant;
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is increasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is two-stage reduction, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increasing, the fuel regulation demand is three-stage reduction, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreasing, the fuel regulation demand is two-stage reduction, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the fuel regulation demand is one-stage reduction, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increasing, the fuel regulation demand is one-stage reduction, and if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreasing, the fuel;
when the actual measured value of the main steam pressure is higher than the set value and the trend of change is decreasing: the fuel regulation requirement is unchanged no matter the current state and the variation trend of the main steam temperature;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is constant: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is increased, the fuel regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is decreased, the fuel regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the fuel regulation demand is increased in a second stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is increased, the fuel regulation demand is increased in a first stage, and if the actual measured value of the main steam temperature is lower than the set value and the change trend is decreased;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is increasing: the fuel regulation requirement is unchanged no matter the current state and the variation trend of the main steam temperature;
when the actual measured value of the main steam pressure is lower than the set value and the trend of change is decreasing: if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is increased in a first stage, if the actual measured value of the main steam temperature is higher than the set value and the change trend is constant, the fuel regulation demand is increased in a second stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is constant, the fuel regulation demand is increased in a third stage, if the actual measured value of the main steam temperature is lower than the set value and the change trend is.
7. The intelligent optimization method for the water and fuel control of the thermal power generating unit based on the demand diagnosis as claimed in claim 5, wherein the detailed step of the step 2.2B) comprises the following steps: presetting fuel control optimization commands to correspond to fuel regulation requirements one by one, wherein the fuel control optimization commands are obtained by the deviation between a main steam pressure set value and a measured value through a broken line function G1(x)～G7(x) And obtaining after mapping.
8. The intelligent optimization method for the water supply and fuel control of the thermal power generating unit based on the demand diagnosis as claimed in claim 1, wherein the step 3) of overlapping the water supply control optimization command and the fuel control optimization command to the water supply control loop and the fuel control loop of the thermal power generating unit coordinated control system further comprises the step of controlling the tracking switching of the water supply control optimization command and the fuel control optimization command: when all links of the water supply control loop are put into automation and continue for 45-70 s, the water supply control optimization instruction is acted, otherwise, the water supply control optimization instruction is 0; when all links of the fuel control loop are put into automation and continue for 45-70 s, the fuel control optimization instruction is acted, otherwise, the fuel control optimization instruction is 0.
9. A thermal power generating unit water supply and fuel control intelligent optimization system based on demand diagnosis, comprising a computer device, wherein the computer device is programmed or configured to execute the steps of the thermal power generating unit water supply and fuel control intelligent optimization method based on demand diagnosis according to any one of claims 1 to 8, or a computer program which is programmed or configured to execute the thermal power generating unit water supply and fuel control intelligent optimization method based on demand diagnosis according to any one of claims 1 to 8 is stored in a memory of the computer device.
10. A computer-readable storage medium having stored thereon a computer program programmed or configured to execute the intelligent method for optimizing the feedwater and fuel control of a thermal power generating unit based on demand diagnosis according to any of claims 1 to 8.
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